Discharge shutter for mixing and analogous apparatus



Jan. 28, 1930. A. B. SMITH ET AL 1,744,928

DISCHARGE SHUTTER FOR MIXING AND ANALOGOUS APPARATUS Filed Sept. 19, 1929 FIG 6 IN VEN TORS. M

Patented Jan. 28, 1930 UNITED STATES PATIENT OFFICE ALFRED BARTLETT SMITH AND CLIFFORD Ross SMITH, or WOLVERHAMPTON,

ENGLAND I DISCHARGE SHUTTER FOR MIXING AN .ANA LOGOUS APPARATUS Application filed September 19, 1929, Serial No. 393,655, and in Great Britain May 29, 1929.

In such apparatus as mixing apparatus, in which the materials under treatment are thrown about in a pan or the like, a discharge door or shutter which can be definitely closed, notwithstanding the presence of some material around the opening, is desired. Usually such a door or shutter is not obtainable in a manner which ensures simplicity and quickness of operation.

The present invention has for its object to provide a hand operated discharge shutter which can be rapidly opened or'closed, and can be tightly closed against the resistance of any material left behind inits path by the 5 discharge, as well as being locked against accidental movement in both the open and closed positions.

These objects are attained'bythe means illustrated in the appended drawings.

Figure 1 is a sectional elevation-of the shutter mechanism, with the shutter in the closed position.

Figure 2 is a similar view with'the lever handle raised to horizontal position at the commencement of the opening operation.

Figure 3 is a plan of'Figure 2. Figure 4 is a similarview to Figures 1 and 2 but showing the fully-open position.

Figure 5 is a view of the shutter guide without the shutter and its lever handle.

Figure 6 is a cross section on line 6-6 thereof.

In accordance with the invention, the shutter a is provided with a pivotal lever handle 6 provided with a cam-shaped lateral projection 0 and a fixed bracket (Z, to guide the shutter as it is drawn back, is secured to or formed with the mixer or like pan or container e. In the guide wall is a gap or recess f with an abutment face 9 at the front end (i. e. away from the container wall) and a second abutment h at the back end (near the container wall).

When the shutter a is closed, the pivoted handle 6 is swung down or allowed to fall into an inclined position with its cam-shaped projection c in the recess or gap 7 and hearing against the front abutment 9; Figure 1.

The action of pressing down the handle and rolling the cam face 0 on this abutment,

the cam projection crides off; the end'of the door guide (l and, the handle can beswung or allowed to fall into 'a 'p'endulous position forces the handlepivot 2' on the door or shutter an inwardly; thus forcing the door into' closed position against the resistance of any material which may be clogging its path. The weight of the handle in this position forces the cam into engagement with abutment 9 and retains the door or shutterclosed." J The lifting of the handle b frees this lock and the door can be quickly opened by a smart pull which draws it along its guide. If the door resists movement, by raising the handle 5 further, one can bring the cam 0 against the rear or inner abutment h on-the guide so as to give the mechanical aid of the leverage of the handle to move the door initially and disturb; any material which might retard the movement of the shutter; see Figure 2. The door can then easily be withdrawn. When the door or shutter a is fully open,'Figure 4,

with the flat back of the cam c behindthe projecting end j of the guide,thus locking the door against accidental closing. The preferred construction is a bow or bail shape handle with two lateral cam-shaped projections working in conjunction with two shutter guides as shown.

The door or shutter a is preferably knifeedged or bevelled at its edges, but no separate claim is made to such knife edges herein.

We claim:

'1. A discharge shutter for mixing and analogous apparatus comprising in combination a shutter, guiding means, dual and spaced abutments on said guiding means a pivoted handle on said shutter and means on said handle for, engaging either of said dual abutments to assist the opening or closing operation. 9Q

2. A discharge shutter for mixing and analogous apparatus comprising in combination a shutter, guiding means therefor, said means projecting outside the normal closed position of the shutter, dual abutments on said guiding means; a pivoted handle on said shutter, a cam thereon projecting laterally therefrom so as to engage either of saidabutments to assist opening or closing operatlon.

3. A discharge shutter for mixing and 1.00

analogous apparatus comprising in combination a shutter, guiding means therefor, dual spaced abutments on said guiding means and a projecting end portion on said guiding means: a handle pivoted on said shutter and means on said shutter for engaging either of the spaced abutments, or for bearing against said projecting end portion to assist the operations of opening or closing the shutter or to w lock it in the open or closed position 4. A dlscharge shutter for mixing and analogous apparatus comprising in combination a shutter, means on said apparatus for guiding said shutter in its opening and closing 15 movements, said means projecting outside the normal closed position of the shutter, dual raised abutments on said guiding means; a pivoted handle on said shutter a cam thereon projecting laterally therefrom near the pivot,

a projecting end on said guiding means and a flat back portion on said cam, whereby as the handle is swung on its pivots the faces of said cam may be brought into engagement with either of said abutments, or the back thereof 25 may bear against the projecting end of said guiding means.

5. A discharge shutter for mixing and analogous apparatus comprising in combination a shutter, guiding means therefor fixed w on said apparatus a plurality of abutments on said guiding means, a bow handle pivoted on said shutter and carrying laterally projecting means for engaging said abutments and assisting the operations of opening or closing 35 the shutter or the maintenance of it in either open or closed position.

In testimony whereof we afiix our signatums' ALFRED BARTLETT SMITH. w CLIFFORD ROSS SMITH. 

